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Technical Journal, Vol. 11 No. 3, 2017.

Original scientific paper

The influence of chloride ion concentration on the corrosion behavior of the CuAlNi alloy

Ladislav Vrsalović orcid id orcid.org/0000-0001-6111-5475 ; Faculty of Chemistry and Technology, University of Split, Split, Croatia
Ivana Ivanić ; Faculty of Metallurgy, University of Zagreb,Sisak, Croatia
Diana Čudina orcid id orcid.org/0000-0002-7932-3843 ; Faculty of Chemistry and Technology, University of Split, Split, Croatia
Lea Lokas orcid id orcid.org/0000-0002-2377-5074 ; Development-Innovation Center AluTech, Šibenik, Croatia
Stjepan Kožuh ; Faculty of Metallurgy, University of Zagreb, Sisak, Croatia
Mirko Gojić ; Faculty of Metallurgy, University of Zagreb, Sisak, Croatia

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Abstract

The influence of different chloride ion concentration (0.1 %, 0.5 %, 0.9 % and 1.5 % NaCl solution) on the electrochemical behaviour of the cast CuAlNi alloy was examined with electrochemical techniques (open circuit potential measurements, linear and potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS)). After polarization measurements, electrode surfaces were examined with an optical microscope and the SEM/EDS analysis. Polarization measurements revealed that an increase in chloride ion concentration leads to an increase of the corrosion current density values and a decrease of the polarization resistance values, which indicated a higher corrosion attack on the alloy. The examination of alloy surfaces with an optical microscope and the SEM/EDS analysis has shown that there is no indication of pitting corrosion in the 0.1% NaCl solution, but pits were clearly visible on the samples which were examined in the higher chloride concentration solutions. The EDS analysis has shown the existence of copper oxide on the electrode surface and a presence of a small percentage of aluminium in the form of aluminium oxide.

Keywords

corrosion; CuAlNi alloy; electrochemical methods; SEM/EDS analysis; shape memory alloy

Hrčak ID:

186647

URI

https://hrcak.srce.hr/186647

Publication date:

15.9.2017.

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